Otiorhynchus (Nihus) grischunensis , Germann, Christoph, 2010
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|Otiorhynchus (Nihus) grischunensis|
Holotype ( Fig. 3View FIGURE 3 A): 1 Ƥ: 1 st label: Switzerland, Passo del Bernina, 2100 m a. s. l., N 799.000 / E 143.000 [ Swiss coordinates], sifted from litter and mosses, 24.8. 2001, leg. C. Germann; 2 nd label: Otiorhynchus muelleri Rosh. det. P. Scherler 2001 [wrong determination]; 3 rd label: Otiorhynchus ( Nihus ) spec. L. Magnano det. 03; 4 th label (red): Holotype Otiorhynchus grischunensis des. C. Germann 2009 ( NMBE). Note that the spermatheca of the holotype has been lost.
Paratypes ( Figs 1View FIGURE 1. O & 3View FIGURE 3 B): 2 Ex. 1 Ƥ: 1 st label: “ Suisse, Grisons, s/St. Moritz [above St. Moritz], 2100 m [a. s. l.], 21.9. 65 , A. Comellini”; 2 nd label: Paratype Otiorhynchus grischunensis des. C. Germann 2009 ( MHNG). 1 Ƥ: 1 st label: „Davoser Berge, 2500 m [a. s. l.], Dr. Wolf, Schiahorn 14.9.1932; 2 nd label: O. (s. str.) rhilensis Strl. , det. Behne 1993; 3 rd label: bulgarische Art, Fundort verwechselt? [remark by Lutz Behne]; 4 th label (red): Paratype Otiorhynchus grischunensis des. C. Germann 2009 ( MHNG).
Size: Length of body exclusive of rostrum, 3.3–3.5 mm.
Body colour: auburn to dark brown.
Head, rostrum and antennae: Colour auburn to dark brown. Rostrum covered with broad pale-brown scales, scales thinner towards rostral apex. Rostrum at insertion of antennae strongly bulged, half size of frons between eyes. Eyes bulged, protruding. Antennal scape strong, diverging in first fourth. First two segments of antennal funiculus longer than wide (L/B: 1 st: 1.5–1.6; 2 nd: 1.4–1.5), following five segments continuously broadened, wider than long (3 rd: 0.8 to 7 th: 0.5).
Pronotum: L/B: 0.8–0.85. Transverse, laterally strongly rounded, widest behind middle, more strongly constricted at front margin than at hind margin. Surface irregularly tuberculate, punctuate between tubercles.
Integument covered with adherent oval pale-grey scales, hardly longer than wide and raised rod-shaped scales, slightly diverging at apical third, scales four to five times longer than wide, arising from tips of tubercles.
- (rostrum longer) - (rostrum shorter)
- pronotum lengthend - pronotum rounded
- elytra lengthend - elytra rounded
- spiculum ventrale rounded (*) - spiculum ventrale concave/incised
- at high altitude in xeric habitats - mixted habitats (montane forests to alpine dwarf-shrub
- SE distribution (Caucasus, Turkey, Bulgaria, Greece, - NE distribution (Carpathian mountains to Austria and Dalmatia to Italy) and one species in Switzerland Italy)
B) species and subspecies
O. rhilensis Stierlin, 1888 O. praetutiorum Di Marco & Osella, 1998 O. uludagicus Magnano, 2001 O. proximus proximus, Stierlin, 1861 O. winkelmanni Magnano, 2004 O. proximus depauperatus Penecke, 1935
O. sp. n. ( Di Marco & Osella 1998, i. l.)
Elytra: L/B: 1.25–1.26. Pear-shaped, shoulders rounded, widest slightly behind the middle. Integument covered with three types of pale-brown scales: (I) oval, hardly longer than wide, adherent, (II) small, short rod shaped raised scales, three times longer than wide, and (III) long raised rod-shaped scales, three to four times longer than wide, diverging at middle, arising from interspaces. Interspaces flat and loosely covered with mostly four rows of type I scales. Scales of type II arise between distinct punctures of striae.
Legs: Auburn coloured, densely covered with various types of pale-brown scales, all femora unarmed.
Spiculum ventrale, spermatheca and ovipositor: ( Figs 4View FIGURE 4 A –C)
Differential diagnosis: Otiorhynchus grischunensis belongs to the O. rhilensis species group with a more elongate elytra and a rounded (not clearly incised) anterior margin of the spiculum ( Fig. 4View FIGURE 4). Among external morphological characters and such (female) genitalic characters as the spiculum ventrale and spermatheca, O. grischunensis sp. n. shows great similarity to O. rhilensis ( Figs 1–3View FIGURE 1. OView FIGURE 2. OView FIGURE 3). Otiorhynchus rhilensis is known to be a polymorphic species ( Magnano, 1979, 2001a) comprising both, bisexual and parthenogenetic populations ( Magnano, 2004) and showing considerable variability ( Figs 3View FIGURE 3 C –F). At present, O. grischunensis is known only from females. The following morphological differences between O. grischunensis and O. rhilensis are based on comparison with O. rhilensis specimens from several localities (populations) to ensure the reliability of the traits used (Appendix 1).
- the pear-shape of the elytra with the shoulders completely rounded ( Fig. 1View FIGURE 1. O) in O. grischunensis (in O. rhilensis the shape varies from rounded to elongated and the shoulders are not completely rounded ( Figs 2View FIGURE 2. O & 3View FIGURE 3 C –F))
- the scales on the interspaces on the elytra are small, four scales easily cover the width (in O. rhilensis the scales on the interspaces are larger and usually three scales cover the width of the interspaces, in some specimens (Slavianka, S Goleschovo, Fig. 3View FIGURE 3 F), striae are completely covered with dense scales)
- base of the spiculum ventrale is rectangular to trapezoid with basal branches converging at a sharp angle ( Figs 4View FIGURE 4 A –C) (in O. rhilensis the base is rounded with the angle of basal branches less sharp ( Figs 4View FIGURE 4 D –F) Bionomy: The holotype was collected by sifting mosses and lichens as well as leaf litter under dwarfshrub heath ( Rhododendron , Vaccinium ) above 2100 m a. s. l. ( Fig. 5View FIGURE 5). Together with O. grischunensis the following Curculionidae-species were found (ordered by dominance): Otiorhynchus pauxillus Rosenhauer, 1847 , O. pupillatus Gyllenhal, 1834 , O. varius Boheman, 1843 and Dichotrachelus imhoffi Stierlin, 1857 .
Derivation of Species Name: The name “ grischunensis ” is a Latinized adjective of the region where the species was found, the canton Grisons, in the written language Romantsch Grischun.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Otiorhynchus (Nihus) grischunensis
|Germann, Christoph 2010|
O . khatiparicus
|Davidian & Arzanov 2006|
O . meoticus
|Davidian & Arzanov 2006|
O . winkelmanni
O . uludagicus
O . proximus iteratus
O . praetutiorum
|Di Marco & Osella 1998|
O . salassorum
O . noskiewiczi
O . proximus depauperatus
O . poianae
O . leonhardi
O . hypsibatus
O . rhilensis
O . proximus proximus